improve a bit processing of errors

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index c80d82259504474f8742577d2e0ebb1c58f589b4..44d29b3dcc1261f9999dfd6d02f86ccee0a18873 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit c80d82259504474f8742577d2e0ebb1c58f589b4
+Subproject commit 44d29b3dcc1261f9999dfd6d02f86ccee0a18873